[YUNIKORN-421] Define app gang scheduling info in API package.

[yangwwei]

No description provided.

[kingamarton]

Please check and fix the e2e tests. It seems that there are some issues with JSON unmarshalling: "error unmarshaling JSON: while decoding JSON: json: cannot unmarshal array into Go struct field ApplicationSpec.taskGroups of type v1alpha1.TaskGroups"

[codecov]

Codecov Report

Merging #200 into YUNIKORN-2 will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           YUNIKORN-2     #200   +/-   ##
===========================================
  Coverage       58.29%   58.29%           
===========================================
  Files              33       33           
  Lines            2928     2928           
===========================================
  Hits             1707     1707           
  Misses           1149     1149           
  Partials           72       72           

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